'My Sister' is about a 5-year-old girl, who is the silent witness of the growing tensions in her family, but is too little to intervene.

Enigmatic Dutch crime lord Mirko is always a step ahead of the national police team. When Mirko's gang are forced to kill Russian mob baron Jegor's cousin Oleg, the cops hope their time has come. Both sides resort to dirty tricks, testing loyalties and using the antagonists' daughters and independent pimp Aziz for blackmail, which makes several bloody victims.